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I downloaded a new version of Firefox to my 2004 iMac. Now it does not work

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How can I get back my old version of Firefox that did work?

How can I get back my old version of Firefox that did work?

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For older Macs that aren't supported in Firefox 4.0, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 .
http://www.floodgap.com/software/tenfourfox/

Or revert to Firefox 3.6.17
http://www.mozilla.com/en-US/firefox/all-older.html